Cli updater (#3382)

cli/update/command.go

@@ -0,0 +1,72 @@
+package update
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/rs/zerolog/log"
+	"github.com/urfave/cli/v2"
+)
+
+// Command exports the update command.
+var Command = &cli.Command{
+	Name:  "update",
+	Usage: "update the woodpecker-cli to the latest version",
+	Flags: []cli.Flag{
+		&cli.BoolFlag{
+			Name:  "force",
+			Usage: "force update even if the latest version is already installed",
+		},
+	},
+	Action: update,
+}
+
+func update(c *cli.Context) error {
+	log.Info().Msg("Checking for updates ...")
+
+	newVersion, err := CheckForUpdate(c.Context, c.Bool("force"))
+	if err != nil {
+		return err
+	}
+
+	if newVersion == nil {
+		fmt.Println("You are using the latest version of woodpecker-cli")
+		return nil
+	}
+
+	log.Info().Msgf("New version %s is available! Updating ...", newVersion.Version)
+
+	var tarFilePath string
+	tarFilePath, err = downloadNewVersion(c.Context, newVersion.AssetURL)
+	if err != nil {
+		return err
+	}
+
+	log.Debug().Msgf("New version %s has been downloaded successfully! Installing ...", newVersion.Version)
+
+	binFile, err := extractNewVersion(tarFilePath)
+	if err != nil {
+		return err
+	}
+
+	log.Debug().Msgf("New version %s has been extracted to %s", newVersion.Version, binFile)
+
+	executablePathOrSymlink, err := os.Executable()
+	if err != nil {
+		return err
+	}
+
+	executablePath, err := filepath.EvalSymlinks(executablePathOrSymlink)
+	if err != nil {
+		return err
+	}
+
+	if err := os.Rename(binFile, executablePath); err != nil {
+		return err
+	}
+
+	log.Info().Msgf("woodpecker-cli has been updated to version %s successfully!", newVersion.Version)
+
+	return nil
+}